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In this code, we assign the value type i to a reference type o as well as a reference type oo. We already discussed that value types are defined on the stack, whereas reference types are defined on the managed heap. So, how is it possible to assign a stackbased entity to something that should be allocated on the managed heap The answer lies in what is known as boxing. Transparent to the developer, the CLR automatically performs the following tasks when value types are assigned to reference types: 1. Allocates memory on the managed heap. 2. Copies the memory of the value type (from the stack) to the newly allocated reference type on the managed heap. The reciprocal of boxing is unboxing, where a reference type is assigned to a value type. Unboxing does not, strictly speaking, incur the same cost as a boxing operation. More specifically, when an unboxing operation is performed, the CLR does not copy the contents of the boxed value type. Rather, it simply returns a managed pointer to the value type instance contained within the reference type. Often, however, an assignment is also associated with an unboxing operation, which does incur the cost of copying the boxed value type contents onto the stack. Even though this happens transparently, it is important to know because it can have implications for your debugging session (and also performance if a lot of boxing and unboxing is occurring). Let s begin our discussion of dumping types by examining value types.

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Although char is defined by C# as an integer type, it cannot be freely mixed with integers in all cases. This is because there is no automatic type conversion from integer to char. For example, the following fragment is invalid:

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Documentation or 11 of Advanced Windows Debugging.) All extension commands are executed by prefixing the command with a ! . For example, to invoke the htrace extension command, we would use the following:

At its closest point to Earth, Mars is approximately 34 million miles away. Assuming there is someone on Mars you want to talk with, what is the delay between the time a radio signal leaves Earth and the time it arrives on Mars This program supplies the answer. Recall that light travels approximately 186,000 miles per second. Thus, to compute the delay, you will need to divide the distance by the speed of light. Display the delay in terms of seconds and minutes.